Who is Brian Hickerson? Hayden Panettiere’s on-off boyfriend was with star when she died

• Heroes and Nashville star Hayden Panettiere has died at the age of 36 at an apartment in South Carolina.
• An autopsy revealed no signs of trauma, with toxicology reports pending to determine the exact cause of death.
• Her boyfriend Brian Hickerson called 911 and handed over a bag of Panettiere's medication to police officers at the scene.
• The actor's father Skip Panettiere confirmed her death, while her ex-fiancé Wladimir Klitschko expressed deep sadness.
• Former co-stars including Masi Oka, Connie Britton, Viola Davis, and Tim Allen have paid tribute to the two-time Golden Globe nominee.

IN FULL

Hayden Panettiere’s on-off boyfriend Brian Hickerson was with her when she died. Their history is complicated